A Compressor Discharge Silencer can be rectangular or cylindrical in construction. The circular silencer is made of concentric annular acoustic cylinder enclosed in a robust steel casing with transition cone or dished end at both ends with inlet and outlet nozzles. All Compressor Silencer should be coupled as close as possible to the compressor to prevent excessive pipe radiated noise.

The Centrifugal Compressor Silencer noise is produced primarily by blade-tip turbulence which is a function of horse power, speed, discharge pressure, piping velocities, number of stages of compression, type and number of blades etc. Intake silencer, the air gets baffled via sound deadening substances or tubes. This diminishes the noise. At the same time, they keep the air intake flow restriction of the compressor to a minimum.

The importance of proper sizing of intake and discharge piping cannot be overemphasized. Both intake and discharge silencing is normally required. These Compressor Silencer are absorptive type silencers which are essentially a high frequency, low pressure drop attenuator. It depends on sound absorbing material to dissipate the acoustical energy and are usually straight through designs.

Compressor Silencer Features

While selecting the centrifugal Compressor Silencer, it must be ensured that the flow area throughout the silencer is sufficient to accommodate the air flow without imposing excessive restriction.

These silencers are usually sized for around 5000 to 5500 FPM velocity but not exceeding 7500 FPM velocity to prevent excessive self-generated noise and aerodynamic noise generation.

Input Design Data Required

• Valve outlet pressure / Silencer inlet pressure(Bar or Kg/cm2)
• Air Flow Rate (Kg/hr or CMH)
• Maximum allowable pressure drop (mm WC)
• Temperature (°C)
• Valve Inlet Pressure (Bar or Kg/cm2)
• Silencer Inlet / outlet connection size (mm)

Generally Compressor Silencer are used for Petrochemical refineries & Oil & Gas Plants Steel & Power plants, Chemical plants, with following types

• By Pass silencers
• Reactive silencers
• Blow off silencers
• Compressor air Intake filter silencer
• Compressor discharge silencer
• Gas compressor Suction & discharge silencers